如何分析集合竟价

集合竞价对开盘后个股走势是否有影响？怎么来分析集合竞价？（陕西省王放）集合竞价是指在每个交易日上午9：15～9：25,由投资者按照自己所能接受的心理价格自由地进行买卖申报,电脑交易主机系统对全部有效委托进行一次集中撮合处理过程。在集合竞价时间内的有效委托报单未成交,则自动有效进入9：50开始的连续竞价。     

以集合竞价收盘势在必行

五种主要收盘机制 开盘价格和收盘价格都是股票交易中的重要价格,从实践来看,几乎所有交易所都采取与盘中交易不同的方式(主要是集合竞价方式)决定开盘价,但收盘价格决定方式则差别较大.总的来看,目前国际上各证券交易所采用的收盘价格决定方式主要有以下五种:     

中国股市开、收盘波动性的比较研究

利用EGARCH模型,对2000年1月至2007年4月间沪深两市具有代表性的股票及指数的开收盘收益率的波动性进行实证分析,结果表明收益率序列有明显的ARCH效应,其波动性具有显著的非对称性的冲击的持续性;在样本期内,上交所的个股和指数未能观察到开盘波动性高于收盘波动性的现象,而深交所个股在2006年7月实施收盘集合竞价机制之后比较明显地观察到开盘波动性高于收盘波动性的现象。     

沪深两市开盘信息披露方式的创新探讨

交易信息披露方式作为证券市场交易制度内容之一，影响着市场透明度，有利于强化市场价格发现机能，提高市场效率，改进市场监督作业，对交易所而言，最佳市场透明度必须是在一定的制度、市场结构与政策环境下，估量不同市场参与者相互抵触利利益的比重，对市场公平性、流动性、稳定性、有效性、竞争性统一进行考量并取舍，以寻求平衡，于是本文借鉴国际经验，仅就沪深两市的开盘信息披露现状进行有关探讨。     

融资融券交易对市场和标的个股波动影响的实证研究

作为证券市场的重要制度之一，融资融券交易理论上应具有价格发现、价格稳定、提高流动性等基本功能。本文从融资、融券交易的价格稳定理论机制出发，针对市场和个股两个层面系统而全面地分析融资交易和融券交易的价格稳定作用。研究发现：融资交易对指数波动没有显著影响，融券交易对指数波动有一定平抑作用；融资融券交易对标的个股有价格稳定作用，除极个别个股的融资作用表现不确定。     

市场透明度改变影响交易者行为吗？

基于中国证券市场2003年12月8日提高市场透明度这一事件，本文对市场透明度提高对交易者行为的影响进行了研究。结果发现：市场透明度提高明显改变了交易者的交易策略，主要表现为交易者整体交易指令的激进程度降低，其中交易者减少提交市价指令，增加了撤单的频率。研究还发现，市场透明度提高导致交易者提交价格增进的限价指令的比例下降，而提交小额交易指令的比例增加，同时交易者对交易环境的改变具有学习与逐步适应的能力。     

订单簿透明度对市场质量影响的实证研究

本文主要以行情揭示三档变五档的透明度变化事件来实证订单簿信息透明度对市场质量和订单行为的影响。结果发现,信息透明度提高之后,市场质量得到改善:一是市场流动性显著提高,二是市场波动性显著降低。其机理是透明度提高吸引了投机性投资者及流动性需求者提交订单,市场流动性得以提高,并降低了市场波动性,但是价格发现效率受到轻微影响。此外,研究还发现:(1)机构投资者下单数量和撤单数量减少,但是订单规模变大,表明其合并了小订单代之以大订单。(2)买单和卖单占比、订单久期、订单不平衡程度没有显著变化,但机构投资者撤单比例降低。     

股票集合竞价的博弈分析

一、引言集合竞价是将数笔委托报价或一时段内的全部委托报价集中在一起,根据不高于申买价和不低于申卖价的原则产生一个成交价格,并将这个价格作为全部成交委托的交易价格。集合竞价是一种十分重要的价格发现机制。这不仅因为在集合竞价市场不存在买卖价差,而且也因为集合竞价     

深交所收盘集合竞价制度的实施效果研究

作为交易制度创新的收盘集合竞价制度于2006年7月在深交所主板实施,本文应用事件研究的方法和EGARCH模型,对沪深股价指数及个股在收盘集合竞价制度实施前后的相对成交量和波动性特征进行比较研究,考察该制度的实施对市场微观结构的影响,结果认为收盘集合竞价的实施基本达到预期政策目标。     

公司动态

超牛新股浙江世宝暴涨逾六倍连破八项纪录备 受市场关注的浙江世宝开盘即遭到主力资金爆炒。作为首日上市的新股，浙江世宝只经历了集合竞价和正式开盘两笔大单成交，即因为触碰停牌条例而停牌，堪称史上临时停牌速度最快的新股。同时，浙江世宝创出2007年以来新股上市首日开盘涨幅新高。     

How does the call market method affect price efficiency? Evidence from the Singapore Stock Market

On August 21, 2000, the Singapore Exchange (SGX) adopted the call market method to open and close the market while the remainder of the day’s trading continued to rely on the continuous auction method. The call method significantly improved the price discovery process and market quality. A positive spillover effect is observed from the opening and closing calls. Day-end price manipulation also declined after the introduction of the call market method. However, the beneficial impact from the call market method is asymmetric, benefiting liquid stocks more than illiquid stocks.     

Price-Formation Process of an Emerging Futures Market: Call Auction Versus Continuous Auction

This study assesses the market qualities of alternative price-formation processes for an emerging futures market—the Taiwan futures market. In 2002, the price formation process in the market changed during the period of trade between call auction and continuous auction. The performances of call auction and continuous auction are compared using intraday data. Empirical results show that the market is more liquid, and volatility is slightly lower, under continuous auction than under call auction. Also, there is robust evidence that continuous auction improves informative efficiency. The study suggests that for an emerging futures market like that of Taiwan, continuous auction offers a better trading environment for futures trading. In addition to demonstrating the virtue of continuous auction, this study also finds that the asymmetry in volatility is related to the price formation process. The asymmetry effect exists under continuous auction, but not under call auction.     

Price synchronicity: The closing call auction and the London stock market

In this paper, we consider the impact of the introduction of a closing call auction on market quality of the London Stock Exchange. We employ the market model, RDD and MEC metrics of market quality. These signify substantial improvements to market quality at both the close and open for migrating stocks. We note that these improvements are larger at the open than the close. An important contribution of our paper is that we show that changes to market quality are stronger in those securities that have the lowest liquidity in the pre-call period. In contrast, market quality changes following the introduction of a closing call auction are approximately neutral for high-liquidity securities. We conclude that the implementation of a closing call auction, for high-liquidity securities may not enhance market quality.     

The Effects of Trading Methods on Volatility and Liquidity: Evidence from the Taiwan Stock Exchange

This study contrasts the call and continuous auction methods using Taiwan Stock Exchange data. Volatility under the call market method is approximately one-half of that under the continuous auction method. The call market method is more effective in reducing the volatility of high-volume stocks than low-volume stocks. This contradicts conventional wisdom which suggests that the call market method is superior for thinly traded stocks, while the continuous auction method is preferred for heavily traded stocks. The call market method does not impair liquidity and price discovery. The call market appears more efficient than in the continuous auction market.     

Call auction algorithm design and market manipulation

It is commonly accepted that closing call auctions provide investors with access to closing prices, reduce volatility and reduce price manipulation. This paper argues that call auction design may influence the achievement of these objectives. The paper focuses on one aspect of call auction design, namely the matching algorithm used to set auction prices. Analysis of two real market cases indicates that different algorithms set different prices. The results also indicate that manipulation has a significant impact on call auction prices, with some algorithm designs more effective than others at reducing the impact of manipulation. Alternate call auction design features, such as volatility extensions, may be necessary to more effectively reduce closing price manipulation.     

Impact of the introduction of call auction on price discovery: Evidence from the Indian stock market using high-frequency data

Call markets are claimed to aggregate information and facilitate price discovery where continuous markets may fail. The impact of the introduction of call auction has not been found uniformly beneficial, possibly due to poor design or due to ‘thick market externalities’. This paper examines the reintroduction of opening call auction at the National Stock Exchange of India in 2010. The results suggest that the auctions attract very little volume, the intraday pattern of volume and volatility in the continuous market remains unchanged and a large fraction of price discovery, measured by the Weighted Price Contribution, still takes place in the first 15 min of continuous market. However, the market synchronicity has improved after the introduction of the auction. Our findings suggest that the ability to attract volume in the call auction for effective price discovery depends on the institutional settings and the characteristics of liquidity supply in the market.     

Not all call auctions are created equal: evidence from Hong Kong

On 25 March 2002, the Hong Kong Exchanges and Clearing Ltd (HKEx) introduced an opening call auction. This trading mechanism is designed to facilitate price discovery in the presence of asymmetric information at the market open, increasing opening price efficiency. The design of the HKEx differs significantly from opening auctions in other markets. Contrary to previous research, the results indicate a decrease in market quality following the introduction of the opening call auction. This decline is largest in the less actively traded stocks.

Opening and closing behavior following the introduction of call auctions in Singapore

The Singapore Exchange introduced opening and closing call auctions in August 2000. We find that the frequency of call trades is lower than on other markets. However, when auctions are used, the percentage of daily volume traded in the auction is high. Many days without call trades have quotes during the pre-call periods so that there is an opportunity for learning about equilibrium prices even when there are no call trades. Consistent with prior research, the introduction of call auctions enhances market quality at the open and the close. The call auctions also helped to address the issues that motivated their introduction in Singapore. That is, they increased the volume traded at the opening in initial public offerings and reduced the incidence of closing price manipulation.     

Market structure, informational efficiency and liquidity: An experimental comparison of auction and dealer markets

We report the results of 18 market experiments that were conducted in order to compare the call market, the continuous auction and the dealer market. Transaction prices in the call and continuous auction markets are much more efficient than prices in the dealer markets. The call market shows a tendency towards underreaction to new information. Execution costs are lowest in the call market and highest in the dealer market. The trading volume and Roll's (Journal of Finance (1984) 1127–1139) serial covariance estimator are inappropriate measures of execution costs in the present context. The relation between private signals, trading decisions and trading profits is analyzed.     

The Estimation of Quality-adjusted Rates of Return in Stamp Auctions

The stamp auction market exemplifies markets in which a dominant feature is the quality variation in the traded assets. The observed price changes are a mixture of the “true” price change and the quality variation. This paper applies the time series signal extraction method to obtain estimates of quality-adjusted rates of return and quality-adjusted price indexes for stamp auction price series. The method is applicable to other areas in which there is quality variation or in which values are observed with error. Some features of stamps as an investment are also examined.